January 24, 2013
Yet More Proof that the Big Bang Happened
Ethan Siegel, ScienceBlogs
One of the most amazing ideas to come out of our observations of the Universe over the last century is that our vast, star-filled, mostly-empty Universe hasn’t always been like this.
Today, the Universe is very cold, expanding, and the average distance between galaxies is increasing as time goes on. The farther away a galaxy is, the faster it appears to be moving away from us and the farther towards the red end of the spectrum its light appears to be shifted.
TAGGED: cosmic microwave background radiation, temperature, Universe, Big Bang